Genetic variation in pea (Pisum sativum L.) demonstrates the importance of root but not shoot C/N ratios in the control of plant morphology and reveals a unique relationship between shoot length and nodulation intensity

A - Papers appearing in refereed journals

Ludidi, N. N., Pellny, T. K., Kiddle, G., Dutilleul, C., Groten, K., Van Heerden, P. D. R., Dutt, S., Powers, S. J., Romer, P. and Foyer, C. H. 2007. Genetic variation in pea (Pisum sativum L.) demonstrates the importance of root but not shoot C/N ratios in the control of plant morphology and reveals a unique relationship between shoot length and nodulation intensity. Plant, Cell and Environment. 30 (10), pp. 1256-1268.

AuthorsLudidi, N. N., Pellny, T. K., Kiddle, G., Dutilleul, C., Groten, K., Van Heerden, P. D. R., Dutt, S., Powers, S. J., Romer, P. and Foyer, C. H.
Abstract

Nodule numbers are regulated through systemic auto-regulatory signals produced by shoots and roots. The relative effects of shoot and root genotype on nodule numbers together with relationships to organ biomass, carbon (C) and nitrogen (N) status, and related parameters were measured in pea (Pisum sativum) exploiting natural genetic variation in maturity and apparent nodulation intensity. Reciprocal grafting experiments between the early (Athos), intermediate (Phonix) and late (S00182) maturity phenotypes were performed and Pearson's correlation coefficients for the parameters were calculated. No significant correlations were found between shoot C/N ratios and plant morphology parameters, but the root C/N ratio showed a strong correlation with root fresh and dry weights as well as with shoot fresh weight with less significant interactions with leaf number. Hence, the root C/N ratio rather than shoot C/N had a predominant influence on plant morphology when pea plants are grown under conditions of symbiotic nitrogen supply. The only phenotypic characteristic that showed a statistically significant correlation with nodulation intensity was shoot length, which accounted for 68.5% of the variation. A strong linear relationship was demonstrated between shoot length and nodule numbers. Hence, pea nodule numbers are controlled by factors related to shoot extension, but not by shoot or root biomass accumulation, total C or total N. The relationship between shoot length and nodule numbers persisted under field conditions. These results suggest that stem height could be used as a breeding marker for the selection of pea cultivars with high nodule numbers and high seed N contents.

KeywordsPlant Sciences
Year of Publication2007
JournalPlant, Cell and Environment
Journal citation30 (10), pp. 1256-1268
Digital Object Identifier (DOI)doi:10.1111/j.1365-3040.2007.01699.x
PubMed ID17727416
Open accessPublished as non-open access
Funder project or codeCentre for Crop Genetic Improvement (CGI)
ISSN01407791
PublisherWiley

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